SU1253673A1 - Pneumatic classifier - Google Patents

Description

The invention relates to devices for separating bulk rials by size in an air stream and can be used in the construction materials industry, for enriching coal and ore, and in other sectors of the national economy.

The purpose of the invention is to increase the productivity and efficiency of separation by the inertial separation of large particles and the cleaning of large products.

Fig. 1 shows the classifier, a general view in Fig. 2, view A in Fig. 1 in Fig. 3, a screen attachment assembly (section BB in Fig. L).

The pneumatic classifier contains a body 1, filling devices 2 (shelves), fixed 1; on the partitions 3 connected to the body and forming separation columns 4, above the top part of which a discharge pipe 5 of a small product is installed.

An air inlet 6 is attached to the lower part of the housing, which is located symmetrically with respect to the walls of the housing 1. The feed inlet 7 of the source material is connected to the air inlet 8.

For the removal of a large product are the connections 9 located on both sides of the screens. Screens 10, 11 and 12 are mounted on the casing with the possibility of vertical movement, forming between themselves channels 13 and 14 of supplying a dusty air flow to the separation columns. To prevent large particles from accumulating on the screen, the latter are set at an angle greater than the angle of repose of the material.

The raw material is loaded with the device 15, and a large product is collected into the hoppers 16. For the vertical movement of the screens in the housing 1, grooves 17 are provided in which bolts with a nut 18 are mounted on the screen

Pneumatic classifier works as follows.

The source material through the loading device 15 and the nozzle 7 is fed into the channel 8, where it is picked up by the air supplied through the nozzle 6, and is directed through the channels 13 and 14 to the separation columns 4, with the air flow spreading 67673

at an angle of more than 90 ° and under the action of inertial forces from the stream through the pipes 9 into the hopper 16, the largest particles.

5 When moving along separation columns, coarse fraction material is released from the dust-air flow, which falls on screens 10-12, along which it is poured into bunkers 16. When

10, when transferring from screen to screen, the material is blown by the newly arriving air flow, i.e. there is an additional cleanup - fine material is carried along by the air flow. Pass the separation columns, the fine fraction is directed through the discharge pipe 5 to dust cleaning, for example, into a cyclone, a filter, etc.

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A variant of the classifier operation with a fan mill is possible. At the same time, a dusty air stream is fed from the mill to classification through

25 nozzle 6, and the boot nozzle 7 is closed.

The cut-off size of the material is controlled by varying the speed and air flow, for which the flow area of the channels 13 and 14 changes as the screens 10-12 move vertically.

Thus, the proposed design of the classifier improves productivity by

3 high concentration of material in the air flow and inertial separation of the largest particles at the first stage of classification at the exit from channels 13 and 14. The separation efficiency increases due to the secondary cleaning of the material and the inertial separation of the largest particles at the exit from the channels, as well as due to the destruction of conglomerates

 when hitting the reverse side of screens 10, 11 as the flow exits the feed channel.

The possibility of using the classifier in conjunction with the fan mill 50, when the air flow from the mill is supplied directly to the classifier, greatly expands its scope. In order to determine the efficiency and efficiency of separation, laboratory studies were carried out on a model of the proposed classifier. Classifier consisted

thirty

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31253673. four

from a set of separation columns within t-5 kg / m. As a quantity of 5 pcs., And in each of which material was used, a crumbling shelf was fastened. granite crushed stone with a density of p The tests were carried out at a constant of 2.6 kg / m. The separation of the material according to the nominal air flow rate, while at the same time 5 ultrasonic size classes were carried out

the air flow rate in the separation columns was 5 m / s. Consumption concentration varied in

From the test results, it follows that with consumable concentrations of up to 4 kg / m, the achievable extraction of fractions into a fine product practically does not change with increasing consumption concentration. This allows, no.

tuff l

on laboratory vibrating screens.

The test results are shown in the table.

I

reducing you: high efficiency, increase productivity by 1.6 times in relation to devices with a maximum consumption concentration of 2.55 g / m, which includes the prototype.

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4iut. 2 Editor M. Kelemesh

dz.Z

Compiled by Yu. Pravtorov

Tehred L. Serdyukova Proofreader V. Sinitska

4662/12

Circulation 565 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Claims (2)

1. PNEUMATIC CLASSIFIER, including a housing with vertical separation columns with overflow devices, a loading nozzle of the source material, discharge nozzles of large and small finished products, an air supply nozzle and an air distribution system, characterized in that, in order to increase the productivity and efficiency of separation by inertial separation of large particles and cleaning of a large product, the air supply pipe is installed symmetrically relative to the walls of the housing, air The system is designed in the form of screens installed above the pipe of the air wire under the separation columns with a gap between each other, with an inclination towards the walls of the casing, discharge pipes of a large product are installed on both sides of the screens, and the feed pipe of the source material is connected to the pipe of the air supply. 2. Classifier pop. 1, characterized in that the screens are arranged to move vertically.